When fennel is kissed by an oven’s fiery heat, its strong anise flavor is toned down and replaced by a mellow char and sweetness. Similarly, roasting grapes intensifies the fruit’s juices, deepens its flavor and takes off the acidic edge, giving way to more of a dark, almost winelike character. Together, the roasted fennel and grapes make a lovely warm winter salad, enhanced by a zingy shallot-citrus vinaigrette. The whole lot gets topped off with crunchy, toasted walnuts and a generous shower of Manchego cheese, which lend texture and heft. (You can sub in any sharp and tangy sheep’s milk cheese.)